Stylus assembly

a technology of stylus and tibia, which is applied in the field of stylus assembly, can solve the problems of inability to provide a reliable reference position on the tibial plateau, the area of the joint is subject to considerable wear, and the replacement is likely to be damaged

Active Publication Date: 2016-01-05
BIOMET UK
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The stylus assembly ensures precise alignment and locking of the surgical tool guide, providing feedback on joint surface conditions and ligament laxity, thereby improving the accuracy of surgical cuts and reducing unwanted movement during knee replacement surgeries.

Problems solved by technology

This area of the joint is subject to considerable wear and, in a knee requiring joint replacement is likely to be damaged.
Therefore, the tibial plateau does not provide a reliable reference position.
A problem of existing arrangements is that the removal of the stylus can cause unintentional and unnoticed movement of the cutting guide.
This leads to inaccurate positioning of the cutting guide, with the result that the surgeons' incisions are misdirected.
Whilst the stylus used in the assembly of GB 2426198 provides a reference point for performing a repeatable resection of the tibial plateau, it does not provide any feedback regarding the condition of the joint surfaces and that of the ligaments in the knee.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Stylus assembly
  • Stylus assembly
  • Stylus assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037]Referring firstly to FIG. 1, a clamp assembly is indicated generally at 10. The clamp assembly 10 can be made from stainless steel, metal alloy, any suitable material such as plastics or any combination of these and / or other materials.

[0038]The clamp assembly 10 comprises a substantially C-shaped body 12, a retaining member 14 attached to the body 12, a stylus 16, mounted about and retained by the retaining member 14, an intermediate element 18, and a locking member 20, for securing the clamp assembly 10 to a surgical tool guide 50.

[0039]The stylus 16 has an elongate “handle” portion 17 and a curved “bowl” portion 19. Both the top and bottom surfaces of the curved portion 19 are substantially spherical, but any suitable continuous or discontinuous curved surfaces are contemplated dependent on the joint to which the invention is applied. The curvature of the bowl portion 19 corresponds to the articular geometry of a bearing element of a prosthesis (not shown). The elongate port...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A stylus assembly (10) adapted to align a surgical tool with a bone, the stylus assembly (10) comprising: a mounting element (12,18); a tool guide (50) adjustably mounted relative to the mounting element (12,18); a stylus (16) adjustably mounted relative to the mounting element (12,18) and having a curved portion for engagement with a predetermined part of the bone; and a lockable retaining member (14) for simultaneously locking the surgical tool guide (50) and the stylus (16) to the mounting element (12,18).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a 371 U.S. National Stage of International Application No. PCT / GB2010 / 051275, filed Aug. 3, 2010, and claims priority to British patent application No. 0914116.9 filed Aug. 12, 2009, the disclosures of which are herein incorporated by reference in their entirety.[0002]The present invention relates to an instrument for sizing bone and particularly but not exclusively to a stylus assembly for use in positioning a surgical tool guide used in the resection of a proximal human tibia.BACKGROUND[0003]It is known to provide a surgical tool guide having a resection guide, which assists a surgeon in making accurate and repeatable cuts during surgery. The accuracy of a cut made using a resection guide is mainly determined by the successful positioning and fastening of the guide in the operative area. Typically, a stylus is attached to the guide, which references from a reference point or marker on the body, for example, a bone. T...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(United States)
IPC IPC(8): A61B17/15A61B17/17
CPCA61B17/154A61B17/155A61B17/157A61B17/1764
InventorMURRAYDODDGOODFELLOW, JOHN WILLIAMO'CONNORLLOYD, RUSSELL
OwnerBIOMET UK